The expediency of conducting comparative studies of the assortment of dry sawn oak timber established according to different regulatory documents has been verified: by the current standard - DSTU EN 975-1-2001 and the standard cancelled in 2019 - GOST 2695-83. A methodology for conducting experimental studies of timber assortment has been developed and tested. It has been established that there is a certain correlation between the results of the evaluation of the quality characteristics of the investigated timber, in accordance with the requirements of the relevant regulatory documents. In particular, higher-grade timber according to GOST 2695-83 corresponded to higher grades according to DSTU EN 975-1-2001, but the presence of a different number of grades in the standards used, 5 in DSTU EN 975-1-2001 and 3 in GOST 2695-83, predisposes a certain redistribution of timber among the grades. The studied timber of grade 1 established according to GOST 2695-83 was redistributed into 3 grades (Q-FA, Q-F1a, Q-F1b) according to DSTU EN 975-1-2001, grade 2 timber established according to GOST 2695-83 was redistributed into 2 grades (Q-F1b, Q-F2) according to DSTU EN 975-1-2001, including the lowest quality, and grade 3 timber established according to GOST 2695-83 was also redistributed into 2 grades (Q-F2, Q-F3) according to DSTU EN 975-1-2001.